Asshjnob to eiley stoker



I. A. TAYLOR 1,725,226

DUAL FEEDING APPARATUS Filed Nov. 10, 1926 INVENTOR WITNESS IRVING AJIqYLoR flaw?" 2M 35 past to su '-.invention to Patented Aug.-. 20, 1929.

UNITED STATES PATENT OFFICE.

IRVING A. TAYLOR, OF WORCESTER, MASACHUSETTS, ASBIGNOB TO RILEY STOKE]. CORPORATION, OF WORCESTER, IASSACHUSETTS, A CORPORATION 01' m- OHUSETTS.

DUAL-FEEDING Arr snares.

application filed November 10, 1926. Serial No. 147,587;

This invention relates to feeding devices, and more particularly to an apparatus capable of ;feeding two different materials simultaneously. v 5 Such an apparatus is often useful in connection with pulverizers of the'so-called unit "type, in which coal is pulverized and then delivered directly to a furnace for combustion. It is diflicult to burn anthracite in this manner, because of its low percentage of volatile matter and the consequent low rate of flame propagation. This troublecan be overcome by mixing with the anthracite a certain amount of bituminous coal, which has a much higher percentage of volatile matter. As a further consideration, a shipment of coal is occasionally received which contains so much moisture as to make satisfactory pulverization im ossible. By feeding'some dry coal into t e pulverizer with the wet coal,,no difiicultyis ex erienced. It is therefore desirable to have a eed mechanism which is capable of delivering 'such' different materials satisfactorily. It is essentialthat the feed be uniform, as any irregularity will cause the flame-to fluctuate. Moreover it is important to provide means for regulating the rate of feed, as the demand for heat from thefurnace being fired maxnvary.

thracite is ordinarily: purchased for power use in small sizes coal, on the other hand, frequently contains large lum s, and it has been necessary in the ject it to a preliminary crushing o eration before feeding it to a pulverizer.

'1 e expense ofcrushing such coal in a sepa' rate operation is amaterial item in power plant costs, and a feeder which will handle the ordinar much to be esired. 7

It is accordingly the'main object of this still further object is to provide such only; Bituminous.

.run of coal satisfactorily is.

provide an apparatus which.

an apparatus which wilLnot only feed two different materials at desired rates but will serve to crush one of the materials to suitable size for feeding efiiciently and uni-- formly.

With these and other objects in view, as will be apparent to those skilled in the art this invention resides in the combination of parts set forth in the specification. and covered by the claims appended. hereto.

In accordance with my invention I provide an apparatus which will feed different ,materials simultaneously, and preferably at. regnl'atable rates, and which is so constructed as to insure a uniform rate of feed of each material. I also rovide a device which will serve to breal i any lumps of material found in one of the hoppers.

My preferred construction to accomplish these ends comprises two hoppers, one arranged within-the other, which are relatively movable so as to minimize the tendency for the material to arch over one of the outlets. In order to feed the materials at uniform rates from the hoppers, I may provide for each ho per a table and a scraper, which are relatively revoluble and are so arranged as to cause material to be swept from the table into a suitable discharge opening.

Since there maybe lumps in one of the materials that would interfere with the feedlum s between it and thestationary hopper.

e specific construction illustrated com-. prises an inner hpipper arranged above a orizontal table an connected thereto. An

outer hopper surrounds the innerhopper and delivers material to a horizontal annular portion on the inner hopper which serves as a feed table. The two hoppers are relatively rotatable about a vertical axis, and two scrapers are arranged to remove material from the horizontal table and the annular portion. These scrapers are preferably adjustable. An eccentic, portio'h on the outside of the rotatable hopper and near the hopper.

Referring to the drawings, in which like ,reference numerals indicate like parts:

' Fig. 1 is a vertical section through one embodiment of my invention, the section bein taken on the line 1-1 of Fig. 2;

Tig. 2 is a section on the line 2-2 of Fig.

7 1, certain parts being shown in full for clearness of illustration;

Fig. 3 is a section through the inner hopper on the line 3-3 of Fig. l; and

Fig. 4 is a detail showing the method of I connecting thecontrol levers to the scrapers.

As illustrated in the drawings, one em bodiment of this invention may comprise an inner cylindrical hopper l surrounded by an outer annular hopper 12 which flares outwardly and upwardly, as shown. It is desirable to provide for relative motion between the hoppers, to assist in feeding material from the outer hopper. This may be accomplished by mounting the hopper 12 on the stationary casing 14, and rotating the hopper about a vertical axis. For this purpose, the hopper 10 is provided with radial arms 15 which are supported on a central hub 16. The hub is bored to fit a reduced portion on a vertical post 18, and is attached thereto by key and cap screw 21. The post 18 is in turn threaded, for purposes of assembly, on the end of a shaft 22 WhlCh is mounted in suitable bearings 23 and 24. This shaft may be rotated by any desirable means, such as worm gear 26 and worm 28,

the latter being connected to .a suitable source of ower.

n the lower end of the rotatable hopper 10,- I provide a horizontal annular portion or shelf 30 which projects outwardly and is arranged to receive material from the stationary hopper 12. A horizontal disk or table 32 arranged to receive material from a the hopper 10 is mounted on a reduced por tion on the upper end of shaft 22 and 18 held in place by the post 18 which engages its top surface and serves as a clamping nut.

The annular portion 30 and table 32 rotate together, and in order to sweep thematerial therefrom, I provide scrapers 34 and 35 which project in the path of the revolving material and deflect the outer annular portions thereof and cause them to fall over the edges of the tables and into a suitable chute 36 provided for that purpose; It will be observed that each table projects sufiiciently'beyond the lower ends of its hopper so .that the material may lie thereon at its natural angle of repose, and the casing wall 14 substantially contacts with the outer edge of each table exceptwhere it flares outwardly to form chute 36, as shown in Fig. 2. These scrapers are preferably adjustable,

and for this purpose they may be pivotally mounted on the casing 14 and'connected to control levers 38 and 40. As shown in Fig. 4, lever 38 and scraper 35 are attached by set screws 42 and 43 to. a solid shaft 45. Lever and scraper 34 are attached by set screws 46 and 47 to a sleeve 50 surrounding the shaft 45. A lever sector 52 is mounted on the casing, and the levers may be clamped at any desired position by means of screws 54 and 55.

In order to crush the lump material in the hopper 12, 1 may provide lugs or corrugations and 61 on the opposed surfaces of the inner and outer hoppers, as shown, and the inner hopper has an eccentric portion 64 which varies the size of the outlet as it revolves. In this way, large particles will be crushed between the outer hopper and the eccentric corrugated surface on the inner hopper. Also the tendency for material to bridge over and fail to feed from the outer hopper will be overcome by this arrangement.

The operation of this device will now be apparent from the above disclosure. Coal or other material is placed in the hoppers 10 and 12, whence it flows on to the table 32 and the annular portion 30 respectively. The shaft 22 is rotated by a suitable source of power connected to worm 28, and material is swept into chute 36 at a desired rate by the scrapers 34 and 35. The material in the outer hopper is continuously agitated by the relative motion between the rotating and stationary hopper walls. This serves to prevent the material from arching over the outlet and thus hindering the feeding operation, as is the tendency with wet coal. 1f lumps are present in the outer hopper, they are caught between the corrugated crushing members on the hoppers and broken to a smaller size. This crushing action is made possible by rotating oneof the hoppers. The material in each hopper is supported 011' the table beneath, and only that amount falls into chute 36 as is determined by the positions of the adjustable scrapers. The outlet from the outer hopper is of small size and the crushing members are so arranged that no lumps can clog the opening in which the scraper is located. Moreover, each scraper is made to taper downwardly towards its nose so that lumps will be, less likely to obstruct the opening. The rate of feed depends upon the rate of rotation of the shaft 22 and the position of the scraper,

either of which may be regulated as desired.

It will be apparent to those skilled inthe art that this invention provides a feeding A fuel and particularly where two materials,

such as ores or chemlcals, are to be mixed in re latable' roportions.

aving t us described my invention,

what I claim asnew and desire to secure by Letters Patent is:

1. A dual feeding apparatus comprising two relatively rotatable hoppers for separate materials, one of which surrounds the other, and means cooperating with each hopper to feed the material delivered there from at desired rates, said parts being so constructed and arranged that the relative movement between the hoppers aids in discharging the material from the outer hopper.

2. A feeding'device comprising an inner andan outer hopper which are relatively rotatable hopper connected to an arranged rotatable, an annular shelf beneath the outer hopper positioned so as to receive material therefrom, a table arranged beneath the inner hopper to receive material therefrom, and means for deflecting material from said annular shelf and said table.

3. A feeding device comprising an inner rotatable hopper, an outer stationary hopper, a rotatable annular shelf beneath the outer hop er to receive material therefrom, a rotatab e disk beneath the inner hopper to receive material therefrom, and means for defiectin material from said shelf and said disk to feed the same.

4. A feeding device comprisin an inner above a horizontal table, an outer stationary hopper arranged .to deliver material to an annular shelf on -the inn'erhopper, and adjustable stationary scrapers to deflect material from said table and said shelf.

5. A feeding apparatus comprising a rotary device arranged to feed two materials simultaneously .and means cooperating therewith to crushone ,of the materials before it is fed.

6. A feedin feed tables an ap aratus comprising two an inner and an outer hopper discharging material thereon, said hoppers being relatively movable and so con.- structed and arranged that lumps of material in the outer ho per are crushed before they are delivered therefrom.

7. A feeding ap aratus comprising inner and an outer hopper, one of which is stationary and the other rotatable, a feeding device cooperating with each hopper to feed material discharged therefrom, and means on the opposed walls of the hoppers to crush lumps of material'as they are discharged from the outer hopper.

8. A feeding device comprising an inner and an outer hopper which are relatively rotatable, an annular shelf on the inner ho per arranged to receive material from t e outer hopper, a disk beneath the inner hopper to receive material therefrom, means for deflecting material from said shelf and said disk, and corrugations on one of said ho pers adjacent to the other hopper to aid n crushing lump material.

9. A feeding device comprising an inner and an outer hopper which are relatively rotatable, an annular shelf on the inner ho per arranged. to receive material from t e outer hopper, a disk beneath the inner hopper to receive material therefrom, means for deflecting material from said shelf and said disk, and an eccentric portion on one of said hoppers to aid in' crushing lump material.

10. A feeding device comprising a rotatable hopper, a stationary hopper surrounding the same and having a constricted annular outlet, two rotatable tables beneath and arranged to receive the material discharged from the hop 1's, an adjustable scraper cooperating wit each table to deflect the material and feed it therefrom, and crushing memberson the o posed hoppers within said outlet arrange to break the lumps of material passing from. the outer 

